<font color="blue"> The rear wheels have only 3, 11/16" accessory mounting holes, 10.25" apart! </font>
Another TBNer came to my rescue!
5030 created some weight brackets for me. The top picture shows the bracket, while the bottom picture shows the weights installed. On Class II Boomers, perhaps the other class NH Boomer tractors as well,
when fitted with R4s, use wheels with only 3 accessory bolt holes. When fitted with R1s, there are 4 accessory holes.
I used 8 washers between the bracket and the wheel (to clear the bolt heads that attach the wheel and the welded on nut that the threaded rod screws into) plus 1 washer under the bolt head. The washer under the bolt head wasn't really needed, but I had the washers and I thought it looked better, even though with the weights on, you'll never see them. The back side is a lock washer and a nut. The 1 inch threaded rod the weights hang on can be left removable or secured with threadlocker.
Each wheel has two 50 pound weights (gray weights in the back) and two 25 pound weights (black weights) for a total of 150 pounds per wheel, the maximum New Holland recommends for R4s on Class II Boomers. These 4 weights, fill up the threaded rod, with just enough space on the end for the washer, lock washer and the nut. About 3 threads are showing. Plus they don't extend past the edge of the tire, great for not inadvertently snaring something if you get too close.
I used the washer/lock washer/nut combination instead of the washer/nylock nut Daryl supplied until I determine how much weight I really need. Once I do, I will use the nylock nut and washer.
I also aired up the rear tires to the maximum recommended pressure of 20 psi.
Dick's Sporting Goods has 50 pound weights, with the small center hole for 49 cents/pound (have to buy 2). I had initially bought 2 weights then stopped in a week later and they were on sale for 39 cents/pound.
I could have bought 2 more fifty pound weights to achieve the total of 150 pounds per wheel, but I already had four 25 pound weights I had purchased at Play It Again Sports for 29 cents/pound. If I'd ever decide to exceed (not likely) the maximum weight recommended by NH for R4s, I could replace the two 25 pound weights with two more 50 pound weights for a total of 200 pounds per wheel.
The concept is pretty simple, but if anyone has any questions, feel free to ask away or contact
Daryl.